Pisidium
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Pisidium is a genus of very small or minute freshwater clams known as pill clams or pea clams, aquatic bivalve molluscs in the family Sphaeriidae, the pea clams and fingernail clams.
SEM image of Pisidium sp.
Carl Jonas Pfeiffer
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Carl Jonas Pfeiffer was a German merchant, banker, and amateur malacologist.
Carl's banking interests would eventually become Bankgeschäft L. Pfeiffer and flourish under family directorship for four generations